International Journal of Computer Networks and Wireless Communications (IJCNWC)
The interest in Wireless Sensor Networks (WSN) is increasing due to its advantages related to cost, coverage and network deployment. They are use in civil applications and in most scenarios depend upon the batteries, which are the main power source for the sensor nodes. Energy management is main issue of WSNs. To overcome this constraint at the physical layer node's energy consumption is optimized through the adaptive modulation scheme. The lifetime of the path depends upon the lifetime of lowest energy node. This lead to wastage of energy of all other nodes after the first node dead and decreased the lifetime of network.